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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e2c3acda211c62bdaeae3b64164fe1e3fc2bdad7073ae5dbc35a55f35f79f6' 
  AND token = 'uJ3j339x3QxIYpVo0S4qKOg2FxLEx951M/dLlVTS6k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00929

JSON explain

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