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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bcbf999864a0e42aadf6c241aeff854dc1c3b158f6ed91ca4ea8fe9c1cd420' 
  AND token = 'r3u8yOKvbSTOeyL/4Dr/NXWLPk2pzywwYptgyUEbWwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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