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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6deee2ae4a9a38edcfdf6cab53d52e98d511d18145ad153f3210ba7b7b773338' 
  AND token = 'p1j1ZlYr7QqCoEtJb0DZFAfo4ZCS8l1JzgoRX42F3+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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