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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1725936d47e2cf238210d346f467f0ee1551cc51aa344c6276ebb7045de6cec5' 
  AND token = 'a8YZwPkL252a/7TuQ/HCv7hDBXg4I3evtFnd0ieLo6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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