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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54350378d549b3c8a5a7873c2c55f3cc03065d0173c4934d4c4e7e21ccd0aed4' 
  AND token = 'ckQYuvcFhxAXgYP4eAYcm6N21M5emsZhLsyclYqFZpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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