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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03fb956de29936216734f5f6ae456ca45c0e07c6effb535902d0194cbc8ec10' 
  AND token = '2NN+NIekx4zpxHuJFB9vh49fhv913XfLsuCQgAGprpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}