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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbfab91b3bc86b5e2db6ab71cf00d5164842fa8a56ac1abca307ee0c4e70743' 
  AND token = 'OY9oTH7r1S35ODaem/c1XbrnNE2u56QIEeG8wkCiKxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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