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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2e4a39f87921efe46cf240a2f453e50e57239640b4be1432af1eb2e05926d8' 
  AND token = 'Nwzos4TtNKvjToD9KHtrIC/U0GzPTG8yCccq8dTniuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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