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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d492ed23480854bcb535ddf016d2ade4d2d96714632b91c93eecca2c228728' 
  AND token = 'Te8aJebHD9snopdHexIlcb/hx4dBWQaOmbSx9tHw2TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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