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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d019102b57c5b156ac2c94e2b8351bece260776827d1028d01e132e1ee4f8d' 
  AND token = 'GA83iZFeyLld6+5mcrNE5ae9gw5rvWj51XoNkiBzJ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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