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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d4aa565a6c55845c1cf9f0d9e6a724561cbeae3eef1e09219f0869ca448909' 
  AND token = 'Fe/XLHgLcEi0PwYKojhkNDIyVuKo31Ph7EqoZEHDCo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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