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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613763cc7fc2794803690175d6c67af602f57a6b35d3b1b95977d1953f419b3c' 
  AND token = 'Dizh2kZMdgEYVbX2NjiTSmkDv4jx+YiDE6A75WZUzd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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