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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2b5a3ac61ea7901287c4899765eaf4a36dc5184a092b65f757becb3c14c889' 
  AND token = 'eVA5IZ3QhESS9QHW17SrIWqQugJ/oz6GcEjE2WtRd5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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