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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe6e5d82f24a6551956c0079af44027a6b85b93e5f0c92445e4a610db084575' 
  AND token = 'jyediQsgsl38J+JSRiHjWDDbrkP919kpBDYyxdA3WZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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