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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7608a8b956b74644f9d19d2cc3a8bda476f5f2889e7d7cc735badbaf8a745879' 
  AND token = 'lQ/pn2YlTpF7HMOltGveI3ngAkf01jKg4xbmZEQP7LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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