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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6138ff26cecb8975028dff5fe4ac1ff6085454a19e934d5d5f2325c5e46d39c' 
  AND token = 'Xb1v9VM/exw9dD4ehmV2uPpzwBIN7dNBxCMdCeFk0Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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