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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb928b8a27271b0a791425b943ad48c66cf7e6610ed0155ad85300f18d84fa11' 
  AND token = '5aFng7MNnAaVGUME8fmUy6h4DtesBsV8EgAo968kaMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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