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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d140af7b1974dd196ba2d1262b9bde94c345966098bb3c53d3f84d9ca2e6d8' 
  AND token = 'IVT9OTmD8RqoprkSxtJwSUR+6lUXRF82elG6IQsPHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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