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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc5cd588fcfecaf781ee0bfb22f76806be3cb5b888eeb25d0f92b3c4c4ab08d' 
  AND token = 'kjUHhMF+nDePJ/yNkTIm3umXO6qWJCv1OM2rIfPgHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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