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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd0d348844abd1adc245e82dc2dab30ec94d81f1ed5134670b4468e47031b5' 
  AND token = 'pnla+NGEyT2AOP17tjtx2a/pvqNgiScU3t8Zur58Sv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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