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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1083954bb0bcf6833675d451b1902544bdece3bdfcd59717ea3e0b49d28f4216' 
  AND token = 'lArQbRhAM0gqD9Ra14QZUyGS81wwQeJATkBEbLdYF5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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