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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f175aeb012adfc3a1d4315d9a4026f63a630a85b65de1b33d0e23e00dc572b' 
  AND token = 'vNXxvxgPuggXjG2XvFToRqztCUOMcT3By87C117RRHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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