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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabdb3541b6659d28e39b801d2ac3fe7849adfbeb5c96ba0d39732c8a4ecc580' 
  AND token = 'PXPytDXjxespLtWfV48TJLpgbbn1XOGQ3MsCNsg5pUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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