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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75276d9325025d5ad40e05be8bf6b3839369e8ee1fecafdf145b8cd31e09e86' 
  AND token = 'LY/Li5zpi6EuETvg/gqWu7PP7yCaMmmh2WHI03G1yWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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