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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f5649cb8f133b5682c6dc1e819944b28c17bc98356efdb8d4b8a30e14003ba' 
  AND token = 'KEm0v3eACO7Z4dJEMq5uWaaPgZ2+zXnIGt3vDEMuWF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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