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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c86a1a451389653373f55afe365c19b20a10aae1ce2a06fc3f04741fd3eb432' 
  AND token = 'i5x4tfY8e9FwagRfoGd6hvs4XfvMezIy7xTM5kgVY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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