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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f3abd59e116d04e3a2be6f1e5d1b3e163c1baea5d4626a06646dd9508df783' 
  AND token = '925xwbOgeHVhX448OHEA39ge8+UxdsYYWHc7uEuwBfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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