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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbb96b0723bf0768309c8101d8c22b512640d2315f0eda67beca0f68c34c92a' 
  AND token = 'wHhDjmD4gRfuusJJRoV98HSZfoojS6F946nxsnmTqjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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