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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee4b9557fbbdd4fd532d64adb5fa0ccd0c06cb13f104a67a709e90acd2b29c4' 
  AND token = 'oaehdPtVP4nvKrRslWM/L8RndtFM7zmEw0YxKQaHkN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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