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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05c5f728288c6fdba1dfd4cad7db3d3481835357ca1a8a861990db14b8a0fa3' 
  AND token = 'SeS5d/qZ4SKVfwZjr8xhvW6ncgciTEEJbqS+A7guat0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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