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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c5563987555d51f285565ff583e4641a51849d29590ada926a906f232ef295' 
  AND token = 'ZWqNa4c9xxmAsob9C0hQ9qns1SwO+VZQ2icdHWymOvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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