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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc482d9617ed0ddbf39f48ebff5129c14e26664384cf360fd677f3d90501d78' 
  AND token = 'WrJem3duXNcJzFboEXRlu3pOCfX49hjf7hdhfxiy8E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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