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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360d322e40b9a47c1b7c6eb754320680eba71bc4caf08e09395ea9179013c118' 
  AND token = 'Ci47pnp82ci7Bd0L5wh+zgtKYSzOzSHjCSH+WOEDBDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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