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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d30e1e92a562afc1ef2e250db1b7e9afb9ff5e0ee772cd7989df8b087911c30' 
  AND token = 'F2FJhSkZDa55lp1wRSmeOyutG37Cr4D+koQs3jRVoME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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