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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b7df9fce46cb946263e1483073cf058c0c47471e2b33dab98db6f9b26cf6ec' 
  AND token = '0oohc6Tgoyk+k1v2SwCkUUKRt5z3Ig4Iur2plIRNMLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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