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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fe7d5a2530afe6f0563d9f0916b49bd5300d1e39f4a55df82ceb7b481c8a71' 
  AND token = 'n0OS5IfsSQkwE33JmvP2upaLaweEaFoe3wTzmpkIUBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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