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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcba08e0e7f54cf9cbd972ff21504f690167c49514d3531f03d6e1be94dc8e0e' 
  AND token = '0n4Vu26I567Nj4+foFvvb9OjWM7aiUneiFqjv+eCiHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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