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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3afec0950761bf075780e0e5972b70b281a766da28432328ca15f744fa9cc86' 
  AND token = 'UOeDzVy4swQI6FhGoW3zQAfhU0CTppFNZFpubbBSTP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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