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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0277135a0ec34437e09e78041f134d06ee416d5ef48745742c4a22b9f984711' 
  AND token = '4vvLr/6Wk4UjlYQrP8kTf8e7QWycg5a9lOz146uewHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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