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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bcdf50522437bb16f8a6c605061d71355498a6edb9412e7283b5cda0e96a0c' 
  AND token = 'tV6z8Il7NkXv8yjL3CLZKGMPnwIYYR5e54bMGt49zTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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