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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8920b45754efba11df70d91edbbf1c3c0cca4e817feb4b1752fb83c7d9758ece' 
  AND token = 'fZSoabQF8Th2AfhoDmGvIHVCgk+LVeMVL9SesmhRWjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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