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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86caae1d349c1f2ff9343196a919d736b9e91aa4be58146f37a4340202454b26' 
  AND token = '25xfEa7qCrSPq6pxf/uVHFUBNPOT/cw4rywYUB1tiN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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