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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8d2b9a83c80ec7a95546271bf667ef7dc3a9762f181339c7b4f4f199719f49' 
  AND token = 'ZBuMhv9437c9nO1L/qBhmieYCgmIm5/fUoH9IA8E9j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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