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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c4424449f04d4b0c9ad7bcff9232c015d5e0f1b2c56cd642982cc08986e341' 
  AND token = 'oL5TizwprS1Cm7SRD8pkvdSgVV7kIc080txILX9Xkdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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