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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6574ddf403cb3cdb70e32eeb0978b18c340a9e1cdcabff8f0ded6d9515849e' 
  AND token = 'cTTLZEaJTFKRZby9ANheQkIMXJmk09SLmFa84IKl0k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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