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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f77416edb40eeca5d9e23670327c94a055263fd21dca7ecf7382f8509931ffe' 
  AND token = '8iSOEoxJ6/BC3V8cIfwACon04TeRa8HuOT8orwp9reM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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