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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6229112f33dd23726f9aa1ee52a443b156f9e58ba15977f28f6430b5a3f490' 
  AND token = 'uA19AQn5ny8HKtR+vCgJToiFk+cqzfDaXfJHzR+TL08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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