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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e883c3481ea9359a889934d4333a03ee8ea39c8943e793dcd2bb3d4e959962' 
  AND token = 'gn99VlS9iXVvY/3xM9oHt8lj49FoxU4OhNj4ZNi93lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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