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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec06390d283805a7da553c1e8aa23829ea716a2ef36a3aaa9c4ac8a9b6deed76' 
  AND token = 'HAOO4UqsPmMnBXTaGNw9uil4xSGvpJRML6IarxaNTD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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