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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8257e058f5874535e0db2ae2bca1f09016f16af8288b5bde38d02ee172acf2c' 
  AND token = 'Bj1yezKxaLO7cL2Ltp++Yx9RkSnHjuQLshhaEV+ilnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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