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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d0634a0baa2654bb02503076f42220f0acb36f1d18b4428d7c9cdf7682e6e2' 
  AND token = 'Ak4Vm5oj+jHWmGRGYYJykh0nAo2Qh2ZysQcWn0EUfUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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