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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc435e5766dc8eec1f4e1f1c1e323ed84981c71ac96f8a28a5560fd53da2f1c' 
  AND token = 'wqPDSeMRzEe8L9WFMGHAkO668cHSfe/p0gIOAo31boY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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