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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c1aa13abc128860a2aab448d7bcced470edb688b72a330e1dd8263a9bb4fb3' 
  AND token = 'IJIW2pTjo5MPvewL3wPDyE1WIidV2fBp0hMFZUZLNGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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