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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a004fb30482b1ff81c926ba6677c054f1a3d590ef017919d851b6fb70bc986' 
  AND token = 'cfOnZTws6oB9CEWIGejZS9UOZ/9zc+UHa3XA5PXrJk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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