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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d3b306e9cf01d37a50b45fd7591aa56921c56bb9697607fc41f808a86174b3' 
  AND token = 'zKAs8tCng4pCP3AMJQDaEd7+KiUrw39wykrXbscRuE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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