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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b73f22a2341621547c9f3e6afa46fea2d1e754f5ff07bd5a86c20eb655668f' 
  AND token = 'WHS3psqx8MtJgUz7WQ7/hXHehzTmQel5XJMkBQ4WqGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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