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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0699512b473658cac3c3458c6361da31375b3a0aac175f19d16af665fea51f8' 
  AND token = 'Xm9R3fZrLpkaxjJw5Vxvd5cJ4TfXMzJtKEGiA2Pr5mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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