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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24611886abc92e58db8b87a3297a40e3466ec63207300c28d01dcdcd591480b1' 
  AND token = '5CM9fU7VnpaxKzLLIP7Gm2NjhcraBWG4LOtSd/U1xEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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