SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65eb607d0a481eee74ef7a1f2f3930b3f79dcfb0908af3165fd68d50d3bb0fdc' 
  AND token = 'amqQCUlB3OAKSsHwTsmzbiqv2BpBXMs8FqVqGF6rOUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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