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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7945c0d9acd3029e2acc3e0cebb01740b0998576aacbd6c5520c3709fcc9efd' 
  AND token = 'q3Bd1Rc6cqEK2rJidtnxus3R/nlOP/lRsYibvooEl/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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