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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bd77a86fc0f3c2178bd85d78d7aa47e672bd349eee876c6155788d076bed9f' 
  AND token = 'JsAc+79zpPtXdb1cf5sx+j/7Es5lXTUF+LFdjoTAL8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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