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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53ceb15ae2d0bebe5b015a5cddd28c8a453916ef57b71e06a99cb831910f628' 
  AND token = 'fzZ/E1p5jyL5XUpDIPXLqTx0v4vodQ+KZh0JTKCbaZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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