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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80ca2b0e717e9ef4f271f24ab5d49f0c7ac90e5fc9f6807e9508e04b8567eb7' 
  AND token = 'WumxOdL9U/T6qyocm/XVJ2XO3pMJl0kbsQ/Zt59ueS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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