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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e91a9eb89b24b7ee9464379d01e68865ccc49a6a3fcbb6626ed857701ce211' 
  AND token = 'p9+lfh2MvECy9rlY2ddpYV72/UYJavWK4w3N/UB86Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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