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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b3c30c6fdf10c12f6d1586c3edc158b6ae7a5acf8ebb3e7e7015fcb441ac80' 
  AND token = 'BTWrYu3c8TRFxeiWTr9srLGVPhnC++ME87xVAA0kakk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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