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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0505c6f08c1e0f983ab210fa87c8193e605fb96f7f9adbbee875c14379b46e93' 
  AND token = 'csT6DHMpQoozZbeJhAgQU3M60SZvBtgN8+pqFb8g/04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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